Bending machine



G. MAFERA BENDING MACHINE Feb. 21, 1933.

Filed Sept. 13, 1930 4 Sheets-Sheet l uy ifiafewa Feb. 21, 1933.

G. MAFERA BENDING MACHINE Filed Sept. 13, 1930 4 Sheets-Sheet 2 Inventor attorney G. MAFERA 1,898,254

BENDING MACHINE Filed Sept. 13, 1930 4 Sheets-Sheet 3 Feb. 21, 1933.

G. MAFERA BENDING MACHINE Feb. 21, 1933.

, 1930 4 Sheets-Sheet 4 Filed Sept.

i ae4 m cm. a l My a Patented Feb. 21, 1933,

GUY Mums, ornnvnnn, mssacnosn'rrs IBENDING MACHINE a ncan n filed September 13, 1930. serial No. 481,604. I

This invention relatesfto bending ma chines, and involves certain improvements upon and refinements over the bending machine of my prior Patent No. 1,771,051 issued July 22, 1930, to which reference is made as showing a 'machine of the type involved herein. 7 i I In a general, such improvementsare im.

provements designed to increasethe-effectives 19 ness of the machine not only as.regardsca-' pacity for work, but also as to'the' difierent classes of work which may be performed thereonto the end that productioninay be increased and operation made more reliable 5 and certain at all times and under all conditions of service. l

, The specific character of such improvements and the advantages resulting therefrom are detailed inthefollowing specifica- 29 tion, and a form of machine which I have found highly satisfactory under actual service conditions is illustrated in the drawing accompanying such specification.

In said drawingsa Fig. 1 is a plan section of a machine in accordance with my" present invent-ion, the parts being shown in the position they occupy when the bending dies: are open. 1

Fig.2 is a longitudinal section on the line ,3? 22.of Fig. 1.

Fig. 3 isapartialside elevation particularly detailing one of thecomp'ression springs associated with the operating mechanism for. the blank ejector. r

Figs 4 and 5' are. cross sectionson the line 4-4 of Fig. 7 and showing respectively the blank ejector in its ejecting and non-ejecting positions. i 1

Fig. 6' 's a partial plan at the blank feed chute particularly detailing the laterally adjustable chute walls whereby blanks of different length may be accurately received within and fed from the chute.

V Fig. 7' is a cross sectionv on the line, 77

4. of Fig; 1 1. a e a. 7

Fig.8 is a cross section on the line 8-8- of Fig.1.

Fig. 9 is aperspective view of one of the laterally swinging bending dies, removed.

Fig. 10 is an elevation of a form of die wardly relative to a fixed central die or anvil .15 whereby to bend an interposed-blank B gage the used when the machine is operated as a straight horizontal press, as shown in Fig. 12. Fig. 11 is a fragmentary plan section simi. lar to- Fig. 1 but showing the position of the parts whenthe bending dies are closed.

v Fig. 12 is a view similar to Fig. 11 but. showing the machine adapted foruse as a straight horizontal press, and

Fig. 13 is detail of an article bent on the machine shown in Fig. 1. v Journaled in suitable bearings transversely of the bed or table 1 of the machine'adj acent one end thereof, is a power shaft 2 driven from any suitable power source, as the driving pulley 3. The drive is applied through any suitable clutch 4, cl'utch pin 5, and shipper lever 6. 7

As contemplated herein, Imount on the power shaft 2 adjacent either end thereof a pair of pinions 7 (Fig. 1) meshing with gears 8' on a crank shaft 9 which is journaled transversely of the bed 1 parallel to the power shaft. V

The cranklO of crank shaft 9 is connected by pitman 11, to a longitudinally reciprocable'slide 12.. Theslide 12 is guided in a channeled guideway13, fixed to the bed 1 and on its forward stroke (Fig. 11) swings a pair of oppositely disposed bending'dies 14 inabout said fixed die. V

The bending dies 14, as contemplated herein, are sectional, being made in two parts, as

shown in 7 and 9, and are removable for purposes of replacement or change for size. 1 i

. The complemental members of each die pair are indicated at 14 and 14,and as shown, are shouldered to fit one upon the other in the relationship detailed in Fig. 7, being held together as a unit by the screws or equivalent fastenings 16.

Each die part 14 is configured on its inner face to cooperate with the adjacent face" of the fixed die 15 thereby to impart the desired shape to the blank 13, and each is provided with a centering lug 17 adapted to en ends of the blank B (Fig. 11) and center the blank around the fixed die.

Each die part 14' is configured on its outer face to conform to the curvature of a pair of oppositely disposed rollers 18 revolubly mounted on the slide 12 at either side thereof and adapted to engage the die parts 14 on the forward stroke of the slide whereby to close the bending dies about the fixed die 15. (Fig. 11).

The bending dies 14, considering them as units, are pivoted on a common pivot stud 19 located in the line of the fixed die 15 as well as the line of travel of the slide 12.

The bending dies 14 are opened on the return stroke of. the slide (Fig. 1). In such return, the rollers 18 are withdrawn from engagement with the dies 14 and said dies are swung outwardly on their pivot 19 by means of a pair of crossed slotted links 20 which are fastened at their forward ends'as at 21 to the dies, and connected at their rear ends by a common fastening stud 22 to one of the cross-members of the slide 12.

The stud 22 is disposed in the line of the pivot 19 for the dies, and c s detailed in Fig. 8, said stud is formed with a forked head 22 and a threaded attaching shank 24. The shank 24 is threaded in the cross-bar 23 and beneath the flange of the head 22.

Overlying each link 20 is a rod 25. The rods 25 are guided in separate rings or bearings 26 rotatably sleeved about the forks 22 of the stud head for independent swiveling movement relative to each other.

Coiled about each rod 25 between the stud head 22 and the upturned rear end 27 or any other suitable bearing on the links 20 is a coil spring 28.

The effect of this construction is to compel the bending dies 14 to open as soon as the slide 12 starts its return movement, thus giving a quicker and more positive opening action than where the slotted links simply fitted (We? the pivot stud and the opening action did not occur until the stud moved into a definite position within the slots of the links.

When the slide 12 reaches the limit of its rearward travel (Fig. 1), the links 20 have fully opened the dies 14.

The fixed die or anvil 15 is bolted or otherwise secured as at 29 over a delivery opening 30 (Fig. 2) in the bed f the machine.

The bent collars C Fig. 13, discharge through delivery opening 30 into any suitable collection receptacle or onto any suitable conveyor (not shown).

The die lock 31 for the fined die 15 is bolted at 32 to the machine bed and die, block, and delivery opening are all removably covered, as by the cap plate 33 (Fig. 1).

The blanks B are fed by gravity assisted by any suitable rolling o sliding follower 3 down an inclined feed chute 35 supported in any suitable manner on the bed 1. The blanks discharge singly into the space between the swinging dies 14, when opened,

and the fixed die 15, and such discharge is in properly timed relation to the opening and closing movements of the swinging dies 14.

The blank feed chute 35 is to accommodate blanks of different lengths. To this end, the chute is provided with lateral guides 36 which are adjustable towards and from each other by any suitable manual adjusting means. As disclosed herein, such guides 36 are mounted near the upper and lower ends of the chute on cross-rods 37 each of which is provided with a right and a left hand series of screw threads 38 and 39. The rods 37 are journaled in any suitable bearings and are connected for simultaneous operation, as by means of sprockets 40 and chain 41. One of the rods is provided with a crank 42 by means of which the rods may be rotated and the guides 36 thus adjusted towards and from each other.

The blanks are discharged singly from the lower end of the chute by means of a vertically reciprocating ejector 43 operating across said end of the chute in properly timed relation to the operation of the slide 12 and bending dies 14, and in fact taking its drive from the same shaft 2 which reciprocates said slide.

The ejector 43 is guided in suitable guideways 44 at the lower end of the chute (Figs. 4 and 5) and operates between the chute end and a fixed stop block 45 which is mounted on the fixed die 15 between the ejector and the inner edge of the die block31.

Fast on the crank shaft 9 at either end thereof is a cam 46 for lowering the ejector 43. The cams operate rocker levers 47 at either side of the machine. The levers 47 are fast on a common rock shaft 48 journaled transversely of the machine beneath the feed chute, and are controlled by compression springs 49 (Fig; 3) which are coiled about plungers 50 pivoted to the forward ends of the levers. The plungers are guided in suitable brackets 51 and the springs 49 are confined about collars 52 on said plungers and guides 53 for said plungers formed on the brackets.

The forward ends of the levers are longitudinally slotted as indicated at 54 (Fig. 3) to receive pins 55 projectinglaterally from the ejector 43.

When the ejector is raised to the position of Fig. 5, the endmost blank abuts one or more spring-pressed detents 56 operating beneath the bottom edge of the blank in suitable slots formed in the stop plate 45. Y The detents yield forwardly in the direction of feed of the blanks down the chute upon descent of the ejector as shown in Fig. 4 and thereafter return to the position of Fig. 5 when the ejector again rises thereby to prevent feed of the next blank until the ejector aga n descends.

The blank feeds into the space between the pivoted dies 14 and fixed die 15 and is bent thereby into the finished collar C shown in Fig. 11. In such action, the centering lugs 17 of the bending dies engage the ends of the blank and positively center and hold it in position about the fixed die 15 as the bending dies close about the same.

When desired, the machine may be adapted for use as a straight horizontal press (Fig. 12) by removing the bending dies 14, their closing rolls 18, and their opening devices 20, 25, etc., and substituting therefore the die unit detailed in Fig. 10. Such die comprises a relatively fixed male member 57 of any suitable shape and a relatively movable female member 58. Said die parts are provided with cooperating centering pins 59 and recesses 60. The stationary die member is removably fixed upon any suitable die block 61 and the movable die member is also removably mounted upon a die block 62. The die blocks are yieldingly spaced apart as indicated at 63 and 64, the numeral 64 indicating coil springs about the connecting and spacing members 63.

In the use of this form of my machine, the forward movement of the slide 12 brings the cross-bar 23 thereof against die block 62, causing the die to move towards the die 57 and thereby to bend the blank B therebetween to the desired shape, as determined by the shape of the dies. The die 60 is returned by the springs 64 which yield to permit the dies to close about the blank and expand upon retraction of the slide to open the dies.

Various modifications may be resorted to if within the spirit and scope of my invention without departing from the appended claims.

hat I therefore claim and desire to secure by Letters Patent is:

1. In combination,a reciprocable slide, a relatively fixeddie, a pair of pivoted dies disposed one on either side of said fixed die, means carried by said slide and active on said die pair in one direction of travel of the slide to close the same, means operated by said slide in the opposite direction of travel thereof to open said die pair, said last-named means comprising a pair of longitudinally slotted crossed links fastened at one end to said die pair, a forked stud set through the slots of said links and attached to said slide, a pair of rods disposed between the forks of said stud, apertured collars loosely mounted on the forked head of said stud and mounting said rods for independent swiveling movement relative to each other, and coil springs about said rods.

2. In combination, a reciprocable slide, a relatively stationary die, a pair of pivoted dies disposed one on either side of said stationary die, means acting on said die pair in one direction of travel of the slide to close said dies, and means operated by said slide in the opposite direction of travel thereof to open said die pair, said last named means com prising a pair of longitudinally slotted crossed links fastened at one end to said die pair, a forked stud set through the slots of said links and attached to said slide, a pair of rods disposed between the forks of said stud, a pair of superposed apertured collars loosely mounted on the forked head of said stud and mounting said rods for independent swiveling movement relative to each other, said slides at their rear ends having spring abutments, and coil springs about said rods and confined between said abutments and said forked stud.

3. In combination, a power shaft, a crank shaft driven therefrom, a pair of cams on said crank shaft, a blank feed chute, an ejector operating across the delivery end of said chute, a pair of rocker levers operated by said cams and pivoted intermediate of their ends and forwardly of their pivots having connection with said ejector, and tension means for said levers comprising a pair of plungers pivoted to said levers at the forward ends thereof, guides for said plungers, and compression springs coiled about said plungers.

i. In a blank bending machine, a central fixed die and a pair of lateral pivoted dies, each pivoted die consisting of a pair of complemental die sections shouldered to fit removably upon one another, each die section being provided with a projecting centering lug adapted to engage the ends of a blank and center the blank about the fixed die, and means removably fastening each pair of complemental die sections together.

In testimony whereof I afiix my signature.

GUY MAFERA. 

